/*
 * Alloy Analyzer
 * Copyright (c) 2002 Massachusetts Institute of Technology
 *
 * The Alloy Analyzer is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * The Alloy Analyzer is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with the Alloy Analyzer; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package alloy.transform;

import alloy.ast.ASTDepthFirstReplacer;
import alloy.ast.Expr;
import alloy.ast.ExprCastIntExpr;
import alloy.ast.IntExpr;
import alloy.ast.IntExprCastExpr;

/**
   transforms int Int intexpr to just intexpr.
*/

public class IntCastRemovalVisitor extends ASTDepthFirstReplacer {

    /** remove unnecessary cast from int to Int by detecting
        int Int intexpr */
    public Object visit(ExprCastIntExpr intExpr_) {
    	intExpr_.setExpr((Expr)intExpr_.getExpr().applyReturnVisitor(this));
        Expr expr = intExpr_.getExpr();
        if (expr instanceof IntExprCastExpr) {
            IntExpr replacement = ((IntExprCastExpr)expr).getIntExpr();
            replacement.annotateReplacing("", intExpr_);
            return replacement;
        }
        return intExpr_;
    }

}
